Underworld - Everything Everything Extras

[evwhitton16]

Hello. I am considering buying the Everything Everything live DVD, but there's one thing I'm confused about. YouTube user Succubus Alice uploaded a playlist of 7 extras from the DVD, but only 2 are listed on the DVD case while the others are described as "hidden", so I wondered if anyone how you access them? maybe that's the "internet links to extra material" or "DVD-Rom with interactive text and music installation" listed on the back? Thanks